Another gem from Thursday’s and Friday’s training course: REX – the RIPE NCC Resource Explainer. Historical data on IP space allocated to you by RIPE NCC, reverse DNS stuff, inclusion to blacklists and other interesting data is there. Highly useful when you need to document certain decisions or recommendations to higher management since they come from an unbiased trusted third party. The kind of stuff you expect RIPE NCC to give back to its members.